<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        *{
            margin: 0;
            padding: 0;
        }
        .input-box{
            margin: 10px;
            display: flex;
            align-items: center;
        }
        .input-box input{
            flex: 1;
            height: 40px;
            border: 1px solid #ccc;
            outline: none;
            padding-left: 20px;
            border-radius: 5px;
        }
        .input-box span{
            text-align: center;
            color: lightseagreen;
            width: 60px;
        }
        .list{
            margin: 10px;
        }
        .list .task{
            margin: 20px 0;
            display: flex;
            justify-content: space-between;
            padding: 15px;
            background-color: red;
            color: white;
        }
        .list .task.finished{
            background-color: lightseagreen;
        }
        .empty{
            text-align: center;
            margin: 50px 0;
            color: red;
        }
    </style>
</head>
<body>
    <div id="app">
        <div class="input-box">
            <input type="text" placeholder="输入任务名称"v-model="inputText">
            <span @click="add">添加</span>
        </div>
        <div class="list">
            <div :class="{task:true,finished:item.status}" v-for="(item,index) in tasklist":key="index">
            <input type="checkbox"@click="changeStatus(item)">
            <div class="name">{{item.name}}</div>
            <span class="btn">删除</span>
        </div>
        <div class="empty"v-show="tasklist.length==0">任务列表空空如也！</div>
    </div>
</div>
</body>
<script src="./vue-2.5.21.js"></script>
</html>
<script>
    var v=new Vue({
        el:'#app',
        data:{
            inputText:'',
            tasklist:[]
        },
        methods:{
            add(){
                if(this.inputText){
                    var obj={id:this.tasklist.length+1,name:this.inputText,status:false}
                    this.tasklist.push(obj)
                    this.inputText=''
                }
            },
            changeStatus(item){
                item.status=!item.status
            }
        }
    })
</script>